Refer to
LTI Student User Manual -File types and sizes for the most accurate information.
Size
Files should:
be less than 100 MB,
contain at least 20 words, and
be less than 800 pages.
If your paper exceeds the file size or page count, try to reduce the file size by compressing the file, removing non-text content or submitting the paper in plain text.
...
Turnitin currently accepts the following file types for upload into an assignment:
Microsoft Word™ (.doc and .docx)
Corel WordPerfect® (.wpd)
HTML
Adobe PostScript® (.ps)
Plain text (.txt)
Rich Text Format (.rtf)
Portable Document Format (.pdf) - must contain text to be submitted, see note below.
Hangul Word Processor file (.hwp)
Adobe® PDF
Turnitin will not accept PDF image files, forms, or portfolios, files that do not contain highlightable text (e.g. a scanned file - usually an image), documents containing multiple files or files created with software other than Adobe Acrobat®.